Cokin原廠 P 系列Gradual Grey G2 (ND8)漸層淺灰濾鏡(P121)
也可以手持鏡片邊角，然後將鏡片放到鏡頭前段，一隻手手持鏡片一隻手按快門完成拍攝！
Cokin原廠 P 系列Gradual Grey G2 (ND8)漸層淺灰濾鏡(P121)
漸層鏡是高水準彩色攝影必備的濾鏡，漸層鏡既可以減低畫面局部的光亮度，控制局部反差，避免天空或閃光前景過曝等情況，還能使乏味的天空重現雲彩、湛藍，又可營造出特殊的時間氛圍，渲染主觀個性的天空顏色。
使用時應根據構圖的需要和地平線的高低，上下移動漸層鏡片來調節漸層線的高低位置（這是螺口濾鏡做不到的）；大光圈（或長焦距）會柔和淡化漸層線，因此應利用景深預測功能使光圈收縮到實拍光圈來調整漸層線的位置，避免出現在觀景器裏看到的感覺很好，照片出來以後才發現漸層線跑到下麵去了的現象。
鏡片的顏色是漸層的，濾光係數是分別測試淺色與深色兩部分。漸層鏡的最大作用在於平衡光差，因此，一般無需進行曝光補償，所提供的補償值可以看作是能壓反差的強弱度，或是鏡片顏色的深淺度。
使用前分別對天與地兩個部分測光，在得出光差比值後，選擇淺色或深色的濾鏡、以及單片或是多片濾鏡。
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Gradual Grey G1 Ref. 120 Basically, this Gradual Neutral Grey reduces the total amount of light reaching the film without affecting the color balance. It restores the balance between the main subject and the foreground/background. 120 is colour 1.
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Gradual Grey G2 (ND8) Ref. 121 Basically, this Gradual Neutral Grey reduces the total amount of light reaching the film, but without affecting the colour balance. It restores the balance between the main subject and the foreground/background. 121 is color 2.
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Gradual Grey G2 Light (ND2) Ref. 121L Very light gradual filter, same colour but lighter tone than standard 121.
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Gradual Grey G2 Medium (ND4) Ref. 121M Progressive graduation from the middle to the top of the filter, same colour as121 but lower tone. Only ND4 gradual filter.
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Gradual Grey G2 Soft (ND8) Ref. 121S Progressive graduation from the middle to the top of the filter, same colour & tone than 121.
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Gradual Grey G2 Full (ND8) Ref. 121F Full graduation from the bottom to the top of the filter, same colour & tone than 121.
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系統 P 方型濾鏡：一般83X83mm /漸層83X100mm
Cokin高堅P
Series系統濾鏡介紹